A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 1111500 can be evenly divided by 1 2 3 4 5 6 9 10 12 13 15 18 19 20 25 26 30 36 38 39 45 50 52 57 60 65 75 76 78 90 95 100 114 117 125 130 150 156 171 180 190 195 225 228 234 247 250 260 285 300 325 342 375 380 390 450 468 475 494 500 570 585 650 684 741 750 780 855 900 950 975 988 1,125 1,140 1,170 1,235 1,300 1,425 1,482 1,500 1,625 1,710 1,900 1,950 2,223 2,250 2,340 2,375 2,470 2,850 2,925 2,964 3,250 3,420 3,705 3,900 4,275 4,446 4,500 4,750 4,875 4,940 5,700 5,850 6,175 6,500 7,125 7,410 8,550 8,892 9,500 9,750 11,115 11,700 12,350 14,250 14,625 14,820 17,100 18,525 19,500 21,375 22,230 24,700 28,500 29,250 30,875 37,050 42,750 44,460 55,575 58,500 61,750 74,100 85,500 92,625 111,150 123,500 185,250 222,300 277,875 370,500 555,750 and 1,111,500, with no remainder.
Since 1,111,500 cannot be divided by just 1 and 1,111,500, it is not a prime number.